Keystones — Capstone
Five GCSE retrieval questions · 14 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 2
Answer: 2(x + 1)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 13cm, angle = 51°. Give your answer to 2 decimal places
Answer: 65.67cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 45:35:28 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 11, 53, 52, 78, 59, 74, 36, 12. Give your answer to 2 decimal places
Answer: Mean = 43.44, Median = 52, Range = 67